Combined muffle and open tunnel kiln



P. DH. DRESSLER. COMBINED MUFFLE AND OPEN TUNNEL KlLN. APPLICATION FILED MAY 28. 1919. RENEWED MAY i8.1920.

1 ,36Q,626, I Patented. NOV- 30, 1920 3 SHEETSSHEET 1.

3 m in 11101 P. DH. DRESSLEfL' COMB|NED MUFFLE AND OPEN TUNNEL KILNz APPLICATION FILED MAY 28, 1919. RENEWED MAY i8, 1920.

1,360,626; Patented Nov. 30, 1920.

3 SHEETSSHEET 2.

5] nvenfoz 704cm $494M Patented Nov. 30, 1920.

3 SHEETS-SHEET 3.

INVENTOR mg 0% 9M BY wa i ATTORNEY P. DH. DRESSLEH. COMBINED MU FFLE AND OPEN TUNNEL KILN. APPLlCATlONFILED MAY 23, I9I9.- RENEWED MAYIB, !920.

PHILIP DH. DRESSLER. 151? ZAQN'ESVILLE.

CGIMBZNED MUFFILE AIM) OPEN TUNNEL KILN.

menses.

Specification 0.? Letters Eatent.

'lfu'tented Nov. 30, 1920.'

Application filed May 28, 1519, Serial No 300,443. Renewed May 18, 1820. Serial No. 382,334.

To all whom it may concern. i

Be it known that l, lrrrmc nll. llnnssrnn, a subject of the King of Great lillllctll'l 'ftllfl resident of Zuncsville, in the county of llliu kingrum and State of Ohio, have invented certain new and useful. l improvements in Combined liliull'lezunl Open Tunnel Kilns, ot which the tollowin isn. spccit ration.

My present inxention relates [0 continuous tunnel kilns and the general. object of the in ventiim is to ellect an :uh'untngeous combinetion of constructive features and advantages of two distinct-types of tunnel kilns; one of these two types off-tunnel kilns being the open fire type in which all or the nmjor portion of the heating of the goods is accomplished by direct contact of the goods with hot gnseousproducts of combustion, while the other type isthat type in which the-heat ing of the goods accomplished mainly or wholly by convection currents of the kiln chamber atmosphere passing through or along the goods and about combustion ehnmbers in which combustion occurs and from which the products of combustion are with a better understanding of the invention, how. even and the advantages possessed by it ret erence should be had to the accompanying drawings and descriptive matter in which l have illustrated-e preferred embodiment of my invention.

Of the drawings Figure 1 is n soniewl'let diagrammatic plan 2 is a plan of a. portion of the apparatus shown. in Fi 1. taken on a larger scale tlnm Fig. 1, and Withperts broken away and in section.

is ancleration in section on the line 3---i:l of Fig. 2. 1 p

l is an elevation on the section of the line 4 4: of Fig. 2, me a Fig. 5 is a View taken similiirly to Fig. 1 illustrating a modification.

In the drawings. and reterring;- first to Figs. 14 A represents the kiln proper and B. C and D represent successive sections of re iorming on till. lock. The cars thusenter ing" the kiln are moved slowly throughfthe hitter and issue zit the outer. end 01 the sec tion I) which may zidvau'itageously be pro-- vided with a door Ki t; I have not disclosed any mechanism i'or' merino the cars through the tunnel as the details 0? such mechanism i form no part of my present invention, and mechanisms suitable tor the' purpose are Well known undin common use. It will be understood that the tunnel. normally filled with goods cnrnving curs ii one being taken out of the kiln past the door Ki every timeu. car

is inserted in the kiln past the doors Knn' d K T0 prevcn't the (fllClllillL-lOll of hot gases 1 onion} onto, Assmnon To AMERICAN lmns'sllnzc,

along the truck rails lfl end the wheels and-1 other lower parts of the cars F, the-well.

known GXPedlQlli' is employed of providingthe curs with flanges l at their sides dipping into sand souls in stutionurytroughs F 4 The intermediate kiln section C, is laterilllj enlarged and horizontally elongated combustion chambers it Are located in the lateral. enlargement 'ot this lliln section at -35 the sides of the pnth-wuv for the goods (in.

l l i no; the ends oi the combustion chambers ad-- jzicent the outlet door lift fuel gas supply pipes l open into the combustion chambers. Air torthe combustion of th s gas is admitted to the kiln chamber at the outlet endof the chamber asby means of ports L-' termed 1n the. door lxA.

tending to create a gaseous l'low from the air inlet ports L at the opposite end of the kiln chamber by suitable means, as for instance, the exhaust fan W shown as connected to the kiln chamber adjacent the door i K by the bifurcated pipe N. To force a, large portion of the air thus'drawn through the kiln to-pass intothe combustion cham c'bers H, and .tln'oughthe latter instead of A draft is created throi'ighthe clearance. space between the goods G and the adjecent walls of the kiln chamber section C and combustion chambers 'bustion' chambers ancl in practice. the kiln all at C should he lined with highly refractory material to avoid deterioration under the high temperatures oi the gaseous products leaving the combustion ciamhers. The comhust-ion chambers are so disposed with respect to the Walls of the kiln chamber as to perinit the circulation of convection currents upward past the combustion chain-- that shown in 1 1- inclusive essentially ture attained in the kiln. For sucn cases the form of my invention illustrated in Fig.

is Well adapted.

'lhe lriln All shown in Fig. 5 ("tillers from temperature section C of the kiln, and adhers and downward. through and along; the

goods. For this purpose the alls of combustion chamber may adva formed as in the Well known ll rewle of sections of hollow tile. Poe the tile sections un te to form pa about the combustion chambers while at t-la. same time the goods are shielded against, the direct radiation of heat from the insioe walls of the H.

In operation, the tan hi or other draft producingv deiice causes a continuous gaseous flow from the air inlet ports L through the section D of the kiln chai'nhcr to the adjacent ends of theIconilnistiou chambers ll. The air thu brought to the combustion chambers enters the latter and unites in COT? hustion therein \vith the foe supolied through the fuel gas inlets l. "lhe combustion chamber ll should he of such a length or feet in ordin 1 practice that the fuel gas will be entirely burned in the combustion chambers ancla large portion out the heat of combustion will he Withdrawn. from the products of combustion and delivered to the goods through the medium of the convection currents flowing tnroua'h the passages H and through or along the goods. The partially. {cooled products of combos tion issuing from the exit ends of the corn bustiou chambers pass into the adjacent enoi" the kiln chamber ll and pass lon, .ritudi-- nally oi? the latter to the outlet pipes N. The products of combustion entering" the kiln chamber seztion I) are gradually cooled. in their passage through the latter, impart ingtheir heat to the goods (l in this section of the kiln.

The construction shown in 1--l is intended forusefwhere the goods after passlug through the high temperature 2o I. of the kiln are cooled clown to a subs itial extent before being taken out of the kiln. This is generally the case for instance where the lziln is used in firing port-37y. in ct or cases however. as for example in the industry and inv steel heating: 'flnuaccs it is desirable to Withdraw the goods from the kilns while still at the maximum tempera the vantageously a second door air lock is provided. combustion with the gas supplied by the pipes l, is admitted to the combustion chainbers through air inlets LA. This air may be drawn directly from the atmosphere or may be preheated as conditions require r make desirable.

With each oil the constractions. described ll obtain the lollmving characteristic advantages of a kiln having coinliustimi cha1uof the Dressler type: namely. the indestructihility oi the combustion chambers clue to their thin Wall. construction and tin a forming an Fhe air, uniting 1n abstraction of heat tliieretrmu by convection currents; the good distribution oi heat in the high teingerature zone of the kiln resulting from the tact that the neat transf9? from the combustion clunnliers is mainly by convection currents in the fluid mediiun through which the goods are moved and not by radiation from hot walls or by direct contact. with the burning products cl? combustion; and a sulliciently elongated high temperature Zone to permit an adequate exposure of the goods to the highest kiln temperature with a reasonably rapid rate of travel of the goods carrying cars through the tunnel I also obtain the following advantages cliaracteristic of open lire kilns;

namely, a shorter length of kiln than is reapparatus disclosed. herein and also charao terizing other forms of apparatus devised by me are claimedgenerically in my come-riding application; Serial. No. 353976 filed January 2th 1920.

While in accordance with the provisions of the statutes 1 have illustrated and (lo-- ..ribe(l the nest form of my invention now known to me it will be apparent, to those slrillco in the art that changes may he made in the form of the apparatus disclosed. with out departing from the spirit of my invenas set forth in the appended claims and certain features of my invention etimes he used to advantage Without a corresponding use oi? other features.

i ,ceense liming nowdescribed my invention, What I claim as new and desire to secure .by Letters Potent, is:- I

'lhe conibii'iation in a tunnel kiln having an elongated kiln chamber comprising two sections placed end to end, of a ceinbustion chamber separate from the kiln chamber, extending longitudinally of. the kiln and located in one of said sections and open to the other section at the junction of the two sections, means for supplying air and fuel to the end of the combustion chamber remote from said other section and means for creating a draft through said other section tending to draw the products of combustion out of said combustion chamber and through said other section.

In a tunnel kiln, the conibiinition. with an an elongated kiln. chamber having an air inlet atone end and having a. laterally en lnrged portion intermediate of its ends, a conibnstion chamber separate from the kiln.

chamber, extending longitudinally of the kiln and lo ated in said. laterally enlarged portion of the kiln chamber and open to the latter at each end of said enlarged portion, means for supplying fuel to said combustion rhmnber and means for creating" a draft through said kiln chamber from the end at which the air inlet is located toward the op posite end of the kiln chamber.

3. In a tunnelv kiln, the combination with an elongated kiln chamber haying an air inlet at one end and having a laterally eniged portion. intermediate of its ends, a

combustion chamber,

combustion chamber separate from the kiln chamber, extending lol'igitudinally of the kiln and located in said laterally, enlarged portion of the kiln chamber and open to the latter at each end of said enlarged portion, means for supplying fuel to said combustion chamber, means for creating-a draft through said kiln chamber from the end at which the air inlet is located toward the opposite end of the kiln chamber, and a hafile across the kiln chamber adjacent the end of the combustion chamber toward said air inlet for directing the air from said inlet into said combustion chamber.

4;. in a tunnel kiln, the combination with an elongated kiln chamber'heving an air inlet at one end and having a central laterally enlarged portion connected by tapering portions to end portions of the chamber a. combustion chamber separate from the kiln chamber, extending longitudinally of the kiln and located in said laterally enlarged portion of the kiln chamber, and open to the kiln chamber at each end of said enlarged portion, means for supplying fuel to said I and means for creating a draft through said kiln chamber from the end at which the air inlet is located toward theoppositc end of the kiln chamber,

Signed at city of Zai'iesyille, in the county of Masking-uni and State of Ohio this 19th day of May, A. D. 1919.

, PHILIP nH. DRESSLER.

ll itness C. T. MAnsriALL. 

